.hover-nav {
    margin: 2%;
    margin-top: 1%;
    background: #01081f;
}

.hover-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

.hover-nav li {
    float: left;
}

.hover-nav li a {
    position: relative;
    display: block;
    color: #fff;
    text-align: center;
    text-decoration: none;
    z-index: 0;
}

#content_container li a:before {
    position: absolute;
    content: "";
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background: #2683f6;
    z-index: -1;
    transform: scale(0);
    transition: transform 0.5s ease-in-out;
}

#content_container li a:hover:before,
#content_container li a:focus:before {
    transform: scale(1);
}

.row {
    margin: 2%;
}